Trane RTAA-70 Installation & Maintenance Manual page 132

Table 19 Diagnostic Codes
Diagnostic Description
Phase Unbalance - Cprsr D
Power Loss - Cprsr A
Power Loss - Cprsr B
Power Loss - Cprsr C
Power Loss - Cprsr D
Severe Phase Unbalance - Cprsr A
Severe Phase Unbalance - Cprsr B
Severe Phase Unbalance - Cprsr C
Severe Phase Unbalance - Cprsr D
Slaved EXV E1ec Drive CKT - Rfgt Ckt 1
Slaved EXV Elec Drive CKT -
Starter Transition - Cprsr A
Starter Transition - Cprsr B
Starter Transition - Cprsr C
Starter Transition - Cprsr D
Subcooled Liquid Temp Sensor - Ckt 1
Subcooled Liquid Temp Sensor - Ckt 2
132
Diagnostics
Type Cause
CMR Same as Diagnostic for Cprsr A.
CAR a.
b.
c.
CAR Same as Diagnostic for Cprsr A, above.
CAR Same as Diagnostic for Cprsr A, above.
CAR Same as Diagnostic for Cprsr A, above.
CMR A 30% Phase Unbalance diagnostic has been detected. The
15% Phase Unbalance criteria has been defeated. Items to
check are the Current Transformer Part Numbers (they should
all match). The current Transformer resistances, line voltage
phase balance, all power wiring connections, the contactor
pole faces, and the motor. If all these are OK, replace the
MCSP module of the affected circuit.
CMR Same as Diagnostic for Cprsr A, above.
CMR Same as Diagnostic for Cprsr A, above.
CMR Same as Diagnostic for Cprsr A, above.
CMR Run the EXV electrical drive circuit test both on demand from
the human interface and just before either a circuit or one of a
pair of circuits starts.
CMR Same as Diagnostic for Ckt 1, above.
CMR a.
b.
c.
CMR Same as Diagnostic for Cprsr A, above.
CMR Same as Diagnostic for Cprsr A, above.
CMR Same as Diagnostic for Cprsr A. above.
IFW Open or short.
IFW Open or short.
The Cprsr was running and all three phases of current
were lost.
There was an open Transition input after transition had
been previously proven to have been complete.
There was an incomplete Transition on the first check
after transition and all three phases of current were not
present.
The UCM did not receive a transition complete signal in
the designated time from the UCM command to
transition. The must hold time from the UCM transition
command is 1 second. The Must trip time from the
transition command is 6 seconds.
The Transition Complete input was found to be shorted
before the compressor was started.
Active only if Reduced Inrush Starting is Enabled.
RTAA-SVX01A-EN